/*
 * Copyright 2014-2025 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.netflix.atlas.chart

import com.netflix.iep.config.ConfigManager

object GraphConstants {

  private final val config = ConfigManager.dynamicConfig().getConfig("atlas.chart.limits")
  final val MaxYAxis = config.getInt("max-yaxes")
  final val MaxLinesInLegend = config.getInt("max-lines-in-legend")
  final val MinCanvasWidth = config.getInt("min-canvas-width")
  final val MinCanvasHeight = config.getInt("min-canvas-height")
  final val MaxWidth = config.getInt("max-width")
  final val MaxHeight = config.getInt("max-height")
  final val MaxZoom = config.getDouble("max-zoom")

  case class ValidationResult(
    originalWidth: Int,
    originalHeight: Int,
    originalZoom: Double,
    clampedWidth: Int,
    clampedHeight: Int,
    clampedZoom: Double,
    warnings: List[String]
  )

  def validate(width: Int, height: Int, zoom: Double): ValidationResult = {
    val clampedWidth = math.min(width, MaxWidth)
    val clampedHeight = math.min(height, MaxHeight)
    val clampedZoom = math.min(zoom, MaxZoom)

    val warnings = List.newBuilder[String]

    if (height > MaxHeight) {
      warnings += s"Restricted graph height to $MaxHeight."
    }

    if (width > MaxWidth) {
      warnings += s"Restricted graph width to $MaxWidth."
    }

    if (zoom > MaxZoom) {
      warnings += s"Restricted zoom to $MaxZoom."
    }

    ValidationResult(
      width,
      height,
      zoom,
      clampedWidth,
      clampedHeight,
      clampedZoom,
      warnings.result()
    )
  }
}
